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1-7/8% 10-YEAR TREASURY INFLATION-PROTECTED SECURITIES (TIPS) Due July 15, 2013

Ref CPI and Index Ratios for April 2008

    Contact: Office of Financing            202-504-3550
    DESCRIPTION:                            Series C-2013
    CUSIP NUMBER:                           912828BD1
    DATED DATE:                             July 15, 2003
    ORIGINAL ISSUE DATE:                    July 15, 2003
    ADDITIONAL ISSUE DATE:                  October 15, 2003
    MATURITY DATE:                          July 15, 2013
    Ref CPI on DATED DATE:                  183.66452
    TABLE FOR MONTH OF:                     April 2008
    NUMBER OF DAYS IN MONTH:                30

    CPI-U (NSA) December 2007               210.036
    CPI-U (NSA) January 2008                211.080
    CPI-U (NSA) February 2008               211.693

    Month   Calendar Day    Year    Ref CPI       Index Ratio

    April        1          2008    211.08000       1.14927
    April        2          2008    211.10043       1.14938
    April        3          2008    211.12087       1.14949
    April        4          2008    211.14130       1.14960
    April        5          2008    211.16173       1.14971
    April        6          2008    211.18217       1.14983
    April        7          2008    211.20260       1.14994
    April        8          2008    211.22303       1.15005
    April        9          2008    211.24347       1.15016
    April        10         2008    211.26390       1.15027
    April        11         2008    211.28433       1.15038
    April        12         2008    211.30477       1.15049
    April        13         2008    211.32520       1.15060
    April        14         2008    211.34563       1.15072
    April        15         2008    211.36607       1.15083
    April        16         2008    211.38650       1.15094
    April        17         2008    211.40693       1.15105
    April        18         2008    211.42737       1.15116
    April        19         2008    211.44780       1.15127
    April        20         2008    211.46823       1.15138
    April        21         2008    211.48867       1.15149
    April        22         2008    211.50910       1.15161
    April        23         2008    211.52953       1.15172
    April        24         2008    211.54997       1.15183
    April        25         2008    211.57040       1.15194
    April        26         2008    211.59083       1.15205
    April        27         2008    211.61127       1.15216
    April        28         2008    211.63170       1.15227
    April        29         2008    211.65213       1.15238
    April        30         2008    211.67257       1.15250